2016 rMB - No video on HDMI?

Picked up an m3 rMB this past weekend... and I'm not able to get any video out over HDMI.

I've tried using two different highly-rated 3rd party USB-C "hubs" (reviews say works great w/ '15 model) from Amazon (USB-C to USB-A and HDMI). With both of these, my rMB detects the external display (shows in Display preferences) and the display shows up in System Report.

I've tried 3x HDMI cables and 3x displays, adjusting to 1080p, 1080i, 720p, etc. I have an rMBP which works on each of these configurations. I also tried resetting SMC.

Charging + USB ports on these hubs work, just not HDMI.

Am I missing something simple, or is there possibly an issue with my rMB? Is there a difference between how the '15 and '16 models do video-out? The nearest Apple is stupid busy on the weekends and I'd love to avoid making a trip

Is there any way you can get your hands on the official Apple adapter to try if that works?

Click to expand...

If the apple adapter does work then it just confirms my worries with 3rd party adapters. With iPhones i have wasted a lot of money on 3rd party stuff that either just doesn't work or stops working after a short period. They do use proprietary connection though (old 30-pin, lightning). You wouldn't expect that with USB-C cables as there are technically meant to be universal.

I have a new 16' rMB i5 and Apple multi-port adapter. Everything is working like a charm including HDMI video. Tested Netflix and definitely working on external display. I did do the flash upgrade on the multi-port adapter from Apple which I believe may have sorted out some HDCP issues as well that others were complaining about. Not sure where I read that though.

Anyways, definitely working for Netflix on new AOC 27" Q2778VQE monitor running at 2560x1440 resolution over HDMI on Apple multi-port adapter. USB keys and charging pass-through also working at same time. Cheers!

Picked up an m3 rMB this past weekend... and I'm not able to get any video out over HDMI.

I've tried using two different highly-rated 3rd party USB-C "hubs" (reviews say works great w/ '15 model) from Amazon (USB-C to USB-A and HDMI). With both of these, my rMB detects the external display (shows in Display preferences) and the display shows up in System Report.

I've tried 3x HDMI cables and 3x displays, adjusting to 1080p, 1080i, 720p, etc. I have an rMBP which works on each of these configurations. I also tried resetting SMC.

Charging + USB ports on these hubs work, just not HDMI.

Am I missing something simple, or is there possibly an issue with my rMB? Is there a difference between how the '15 and '16 models do video-out? The nearest Apple is stupid busy on the weekends and I'd love to avoid making a trip

Thanks

Click to expand...

You need the official Apple USB-C to HDMI Adapter.

A bunch of us went through this a year ago, tried our legacy HDMI to USB adapters and such, there's something about the USB-C protocol that's different for HDMI, you need the Apple adapter (or find a third party one that supports HDMI and confirms it works with the RMB).

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